Goodwill (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Goodwill by Segment
Goodwill	$ 250.8	[1]	$ 240.4	[2]
Rail Group
Goodwill by Segment
Goodwill	122.5		122.5	[2]
Construction Products Group
Goodwill by Segment
Goodwill	112.4		105.2	[2]
Energy Equipment Group
Goodwill by Segment
Goodwill	14.1		10.9	[2]
Railcar Leasing and Management Services Group
Goodwill by Segment
Goodwill	$ 1.8		$ 1.8	[2]

[1] (unaudited)

[2] (as reported)